Here’s a simple guide to get all the achievements in the game 🙂
Completionist
Collect all patron cards
Next to a classmate in the study room.
Next to the stairs to the second floor.
In the shoe shelf (the one by the wall)
Turn right after leaving the school, the card pack will be on the street phone.
Behind the benches where backpacks are placed.
At the top of the slide (just climb up on it)
At the bus stop (you’ll end up there after locking the Stranger in the barn)
Around the vending machines near the store entrance.
After goodbyes with two friends, take a look around the garbage area.
Conversationalist & Pop ’em All!
Talk to all classmates
Pop all balloons
Once you throw the ball to the clown on the stairs, this challenge begins. You have to pop all ballons. That’s it. To speed up this process, I advise you to throw a spiked ball into the balloons.
Memopad & Attic
Read the memopad in kidnapper’s house
Go to the attic
Run to friend’s house (Boys)
Run to one of the boys’ house
Run home & Bye
Return home during the chase
Renya’s smile
Police here
Police at the kidnapper’s house
Thanks to iwannaheroin for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.